21372611552 has 96 divisors (see below), whose sum is σ = 43709041152. Its totient is φ = 10281083904.

The previous prime is 21372611537. The next prime is 21372611581. The reversal of 21372611552 is 25511627312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39072143 + ... + 39072689.

It is an arithmetic number, because the mean of its divisors is an integer number (455302512).

Almost surely, 2^21372611552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21372611552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21854520576).

21372611552 is an abundant number, since it is smaller than the sum of its proper divisors (22336429600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21372611552 is a wasteful number, since it uses less digits than its factorization.

21372611552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 992 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The spelling of 21372611552 in words is "twenty-one billion, three hundred seventy-two million, six hundred eleven thousand, five hundred fifty-two".